Convert the Renesas R-Mobile I2C Bus Interface (IIC) Device Tree binding documentation to json-schema. Document missing properties. R-Mobile A1 and SH-Mobile have multiple interrupts. Update the example to match reality. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Wolfram Sang <wsa@kernel.org>